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	<h1>systemd延时启动服务</h1>
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		<div>
			
			
			By wiseai | 2022-12-22 | 1 minutes
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		<div class="tags">
			
			<a class="btn btn-light links btn-sm" href="/tags/linux/">Linux</a>
			
			<a class="btn btn-light links btn-sm" href="/tags/systemd/">systemd</a>
			
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			<p>原因：我的docker容器链接了硬盘上的一个文件夹，但是docker服务在硬盘没有挂载前就启动，容器在目录下自动生成了链接文件夹，导致系统挂载的硬盘名改变，延时启动可以解决这个问题，方法如下：</p>
<p>编辑<code>/lib/systemd/system/docker.service</code>文件</p>
<pre tabindex="0"><code>[Service]
#在这里添加下面两行，就可以延时5分钟启动服务
TimeoutStartSec=infinity
ExecStartPre=/bin/sleep 300
</code></pre><p>参考：<a href="https://blog.csdn.net/lggirls/article/details/128133815">使用systemd配置一个服务再开机后5分钟再启动</a></p>
<p><strong>感谢作者！</strong> 原文如下：</p>
<p>原因：我们的linux服务器上可能会有许多服务要启动，如果再开机后要立即启动的服务过多，很可能会造成开机速度过慢，这时可以对不同的服务进行时间安排，有序的延迟一部分服务的启动。</p>
<p>这里以透传软件 frpc.service 为例。</p>
<h3 id="一单配置文件的实现模式">一、单配置文件的实现模式</h3>
<p>也就是直接对frpc.service进行配置</p>
<pre tabindex="0"><code>[Unit]
Description=Frp Client Service
After=network.target
 
[Service]
Type=simple
User=nobody
# 下面两行设定了再开机后300秒再启动服务
TimeoutStartSec=infinity
ExecStartPre=/bin/sleep 300
 
Restart=on-failure
RestartSec=5s
ExecStart=/usr/bin/frpc -c /etc/frp/frpc.ini
ExecReload=/usr/bin/frpc reload -c /etc/frp/frpc.ini
LimitNOFILE=1048576
 
[Install]
WantedBy=multi-user.target
</code></pre><h3 id="二利用额外的timer服务实现">二、利用额外的timer服务实现</h3>
<p>这样做的好处是，可以额外增加一项设定，配置服务再持续运行24、48小时后重启一次，用于不关机，但需要对某个服务进行定期重启的情况。</p>
<ol>
<li>对 frpc.service 进行修改</li>
</ol>
<pre tabindex="0"><code>[Unit]
Description=Frp Client Service
 
[Service]
Type=simple
User=nobody
Restart=on-failure
RestartSec=5s
ExecStart=/usr/bin/frpc -c /etc/frp/frpc.ini
ExecReload=/usr/bin/frpc reload -c /etc/frp/frpc.ini
LimitNOFILE=1048576
注意，这里的frpc.service 中没有 [Install] 这一部分的设置！！！
</code></pre><ol start="2">
<li>新建一个用于启动frpc.service的timer</li>
</ol>
<pre tabindex="0"><code>vim /lib/systemd/system/frpc.timer

[Unit]
Description=timer for frpc service
 
[Timer]
OnBootSec=5min
OnUnitActiveSec=24h
 
[Install]
WantedBy=timers.target
这里设定了frpc.service 在开机后5分钟再启动，并且运行24小时后重启一次
</code></pre><ol start="3">
<li>启动相关的服务</li>
</ol>
<pre tabindex="0"><code>systemctl disable frpc.service   # 如果frpc.service 之前不是enable状态，则不需要这一步
systemctl start frpc.timer
systemctl enable frpc.timer
</code></pre>
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